nesdev.org

hello, im trying to rewire my 29f040 Flash chip to work on a NROM board. ive rewired only my 5 volts (pin 32) and just left the pin 1,2, 31 unused. but i found this site. http://nintendoallstars.w.interia.pl/romlab/nesmod.htm and found i need to do more rewiring. should i go with this guide and do t...

best thing to do is just get everybook you can find on 6502. i had like 8 different ones at one time. there are so many. it helps alot whenever you get stuck or just get tierd of the same author. plus many different sources is best when studying a subject. checkout http://www.Alibris.com they have s...

six-five-oh-two babay!!!!

is there any information on bypassing the CIC chip entirely. like not having it in a protocart. i want to experiment on protocarts and want to get rid of the CIC entirely.

welp i figured out. i just needed a simple dual reset of the $2005 at the beginning of the NMI and the end.

the actual source file is about 50 pages long and i only pasted what problems i was i was actually having. a huge file or post with all the code would just be time consuming and bad for the eyes to debug. i even hate debuging it sometimes. but pretty much the only going wrong is what i have listed. ...

albailey wrote:I dont really trust my code, but I also reset the PPU address and scrolling before turning back on rendering.

LDA $2002 ; resets the latches
LDA #$00
STA $2005
STA $2005
STA $2006
STA $2006

Let me know if this helps (or not)
Al

nope same thing

ok i tried to see to what exactly is the problem by checking the $2002 before i load my pattern table to see what is going on. WAITVB LDA #$2002 BPL WAITVB STA TEST JSR LD_NT1 .............................. .............................. when i look in the HEX Editor in FCE i get a #$1E (11110) Valu...

after looking back im realizing that i might be using the word nametable in the wrong connotation. what i mean is pattern tables. i switch between pattern tables ( ie. a .nam file that created as my backround)

You don't need to write to $2006. I'd recommend writing to $2000 once (to set bit 8 of both coordinates), $2005 twice (to set bits 0-7 of X and Y), and $2001 once (to turn on rendering). in one of my routines i have a sprite that moves over locations and if i want to set the sprite down i press B. ...

ill still seeing a glich. i figured it was just to much to loading at one time so i omited the nametable load from each screen swap and just left the sprites to load. everything loads without a problem. i then just wrote a single tile to the exisiting nametable using $2007 and still a glich. i seem ...

thanks again. good mourning and good night.

You can only write to PPU either it you turned rendering off what is this you speak of how do i do it? basically hears the layout button pressed | |----NAMETABLE1 lda #$00 sta $2000 sta $2001 jsr NT_1 lda #100100 sta $2000 lda #1011110 sta $2001 RTS |--- should i not desable the NMI before i load a...

hello, hope someone can help. i cant seem to get a flicker on my demo to to stop. im switching between different nametables within my NMI. the new name table works fine. it loads without any problem but there seems to be a flicker right after i load it. it also happens when i write individual values...

sweet. you think its possible to use more than 8kb of memory. i lookin for about a least 8 times this space. would it be possible to link a 64k SRAM to the addressing pins of my PRG ROM and just transfer about less then for 4KB at a time to each bank at a a time (ie. $1000,$2000,$3000,ets.... ) to t...